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Day-Night Sound Level - Ldn is the A-weighted equivalent sound level for a 24 hour period with an additional 10 dB imposed on the equivalent sound levels for night time hours of 10 pm (22) to 7 am (07). Day-Night Sound Level can be expressed as Ldn = 10 log (1 / 24 (15 (10Ld/10) + 9 (10( (Ln + 10)/10))) (1)
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